Interlaboratory comparison of ISO 23351-1: speech level reduction of furniture ensembles

We examined the effects of both wind turbine noise and road traffic noise on symptoms and diseases close to wind turbines and in a control area. Wind turbine sound levels were between 1739 dB LAeq and met the Finnish regulation (40 dB). Daytime road traffic noise levels were 32.5-63.5 dB. Altogether 676 residents responded to the questionnaire. Higher wind turbine sound level was associated with more likely reporting wind turbine noise annoyance and not with reporting of symptoms or chronic diseases. Higher road traffic sound level was associated with higher probability of road traffic noise annoyance, migraine or headache, dizziness, impaired hearing, pressure in ears, tachycardia or heart palpitations, and heart disease. The health effects of wind farms seem to be limited to noise annoyance in areas where all residents are exposed to sound levels under 40 dB. The study has strong practical relevance since new wind power areas always fulfill this 40 dB regulation in Finland. On the other hand, more than 600.000 inhabitants are exposed to road traffic noise levels above 55 dB in Finland. Because high road traffic noise is associated with elevated prevalence of symptoms and a disease in our study, and several previous international studies have found even more serious health effects of road traffic noise, this issue deserves higher concern in the future.